mypy

5d909f1c - Sync typeshed for 1.6 (#15918)

Sync typeshed for 1.6 (#15918) Use the sync-typeshed script to sync the latest typeshed before the 1.6 release. --------- Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com> Co-authored-by: AlexWaygood <alex.waygood@gmail.com>